JPH0457231B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an apparatus for measuring radio waves that can be disassembled, and is housed in a case and a box for convenient transportation. This system uses a drive device with a timing belt and an automatically tightening speed reducer to raise and lower the antenna that receives jamming waves without causing any adverse effects, and allows the antenna to be raised and lowered accurately and reliably.

Describing an example below, a device under test 1 is placed on a stand 2, and the interference radio waves radiated from the device are transmitted to an antenna 4 supported by an antenna pole 3 installed at a certain distance from the stand. It is then received. The distance between the above equipment and the antenna pole is
If the equipment is a television, radio, video or other audio product, the length is generally 3m, and if it is a computer, the length is 10m.

The above equipment is rotated by a constant angle as follows. The table supporting the device is rotatable by being supported by a ball 8 that engages with a groove 7 formed in the upper plate 6 of the case 5, and when a motor 9 in the case is turned, a worm gear 10 pulley 1
1 and 12 rotate, and the rotation of the intermediate shaft 13 causes the clutch 14 and clutch pulley 15 to rotate, which in turn turns the pulley 17 attached to the hollow shaft 16 provided at the bottom of the table, thereby rotating the table. The rotation angle of the table is detected by a detector 18. Note that power to the above-mentioned equipment is taken from an outlet 21 via a brush 19 and a ring 20, and earthing is provided through a grounding ring 22. Manual switching of the clutch is effected by actuation of a knob 24 against a spring 23. At that time, if you install a VU meter near the stand, you can see the maximum position. The height of the platform is adjusted by a knob 61 on the fixing ring 26 that engages the post 25. Normally, the height to the center of the above equipment is set to 80cm.

On the other hand, the antenna supported by the antenna pole moves up and down and rotates as follows.

A cursor 27 is attached to the antenna pole, and the cursor is moved by a roller 2 provided thereon.
8, 29 are guided along the antenna pole so as to roll over the surface of the antenna pole.
Both ends of a timing belt 32, which is wound between pulleys 30 and 31 provided at the upper and lower parts of the antenna pole, are connected to the upper and lower ends of the cursor by means of fixtures 33, respectively. When the motor 34 installed adjacent to the bottom of the antenna pole is rotated, the pulley 31 is rotated via the continuously variable transmission 35, worm gear 36, and brake 37, and the cursor is raised and lowered by the rotation of the timing belt.
The antenna supported by the antenna holder 38 fixed to the cursor can be moved to any height, and the amount and direction of the interference waves from the device can be measured at each position. Also, at each position, the DC motor 3 attached to the above cursor
When 9 is rotated forward and backward, the pulley 40 on the motor shaft and the pulley 42 provided on the antenna support shaft 41
The antenna is rotated horizontally and vertically by a belt 43 placed between the antennas, and the amount of interference waves at that position is measured, thereby making it possible to know the orientation of the parts within the device that emit interference waves. Note that by using the antenna shown in FIG. 6, it is possible to measure interference radio waves of various frequencies. The elevation of the antenna is usually 1~
The upper and lower limits are set by limit switches 46 and 47 that engage projections 45 formed on the disc 44. The height of the antenna is detected by a detector 49 such as a potentiometer, rotary encoder, micro switch, etc. connected via a worm gear 48.

The worm gear 36 has an automatic tightening function and can reliably hold the antenna in a predetermined position, so that the cursor will not fall from its position due to the weight of the antenna mounting portion. Note that a screw gear with an automatic tightening function or the like may be used in place of the worm gear.

In the illustration, the antenna pole is a combination of two antenna poles, which can be connected at an appropriate position with an insertion rod 50. The lower part of the pole is formed double and is removably inserted between opposing support plates 52 until the lower surface abuts against the stopper 51. When inserting the pole, the lower part of the pole is guided by a concentric shaft 53 and an eccentric shaft 54, and by rotating the eccentric shaft, the side of the lower part of the pole is pressed and the screw 55 is rotated at that position. While the eccentric shaft is locked, the entire pole is firmly fixed to the support plate by pressing the side surface of the lower part of the pole with another screw 56. The support plate 52 is fixed in a box 59 by a bottom plate 57 and a reinforcing plate 58, and these boxes, each plate, and the case on the equipment side are made of FRP material, Bakelite, or other non-metallic materials. This prevents any negative effects on radio waves.

Outriggers 60 are appropriately provided in the box,
This makes the support of the antenna pole even more stable.

The above device is rotated by a fixed angle until it completes one revolution, and each time the above antenna is raised and lowered along the pole, data is collected on the strength of each jamming wave when the antenna is held horizontally and vertically at each height position. It is possible to know in which position and direction of the above equipment the unacceptable interference radio waves are being emitted, and to check which parts should be shielded and how. Furthermore, since a timing belt is used to raise and lower the antenna, the antenna can be moved accurately without slipping, and the antenna can be reliably held at a predetermined position by a drive device having an automatically tightening speed reducer. I can do it. Furthermore, since the driving device is provided at the bottom of the antenna pole that supports the antenna, and the device is not directly supported by the pole for movement, the pole may not vibrate while the device is moving. It is easy to measure without bending or bending, and there is no error in the measurement. In addition, the stand and antenna pole are formed so that they can be assembled and can be stored in the case or box, making them easy to transport and allowing the measuring device to be easily transported to any measurement site for lateral measurement. can.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view, Fig. 2 is an enlarged schematic diagram of a device for rotating a device to be measured, Fig. 3 is an enlarged plan view of a cursor, and Fig. 4 is an antenna lifting device. FIG. 5 is an enlarged sectional view showing the cursor guide mechanism, FIG. 6 is another example of an antenna, and FIG. 7 is a limit switch mechanism that controls the upper and lower limits of the antenna's elevation. An enlarged front view, FIG. 8 is an enlarged partial cross-sectional view showing the connecting part of the antenna pole, and FIG. 9 is an enlarged cross-sectional view showing the attached state of the antenna pole.
FIG. 10 is an enlarged partial sectional view showing the lower guide attachment of the antenna pole, and FIG. 11 is a wiring diagram.

Claims (1)

[Claims] 1. A stand that is supported on a case made of non-metallic material and rotates the device that emits radio interference waves by a fixed angle; An antenna pole is provided to support an antenna that receives jamming waves, and the antenna pole is configured to be able to be assembled with the stand and to be stored in the case and the box after being disassembled, and the antenna pole supports the antenna. A timing belt wound around pulleys provided at the upper and lower parts of the antenna pole is coupled to the cursor, and the timing belt is rotated to raise and lower the antenna. A drive device having an automatically tightening speed reducer is provided adjacent to the cursor, a motor for rotating the antenna horizontally and vertically is provided in the cursor, a detector is connected to the platform and the drive device, and the detector is connected to the cursor. A radiation interference measuring device configured to detect the rotation angle of the device and the height of the antenna.